Pillow covering



FIG. 1 is a perspective view of a pillow covering showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a top plan view, the bottom plan view being identical thereto; and,

FIG. 5 is a right side elevational view, the left side elevational view being identical thereto.

The broken lines shown in the drawings are for illustration purposes only and form no part of the design sought to be patented. 

The ornamental design for a pillow covering, as shown and described. 